# Latest

**URL:** https://discourse.itk.org/latest.md?page=3

[Latest](https://discourse.itk.org/latest.md) · [Categories](https://discourse.itk.org/categories.md) · [Tags](https://discourse.itk.org/tags.md)

**Page:** 4

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## [Link what you include?](https://discourse.itk.org/t/link-what-you-include/7639)

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**Author:** [@dzenanz](https://discourse.itk.org/u/dzenanz)\
**Replies:** 0\
**Last updated:** [September 22, 2025, 4:00pm UTC](https://discourse.itk.org/t/link-what-you-include/7639 "2025-09-22T16:00:54Z")

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Has anyone used link-what-you-include tool? Can anyone estimate the effort needed to apply it to ITK? It could be a nice way to keep dependencies between modules and files clean and up to date.

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## [How to use itk.cast\_image\_filter (in Python)?](https://discourse.itk.org/t/how-to-use-itk-cast-image-filter-in-python/7638)

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**Author:** [@constantine](https://discourse.itk.org/u/constantine)\
**Replies:** 1\
**Last updated:** [September 22, 2025, 11:45am UTC](https://discourse.itk.org/t/how-to-use-itk-cast-image-filter-in-python/7638 "2025-09-22T11:45:01Z")

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When I try this: # Here deformation\_field is of type itk.Image\[itk.Vector\[itk.F, 2\], 2\]. deformation\_field\_d = itk.cast\_image\_filter(deformation\_field, ttype=itk.Image\[itk.Vector\[itk.D, 2\], 2\]) I get this error: File …

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## [Build Error: LNK1169 when building ITK with RTK Python wrappers on Windows](https://discourse.itk.org/t/build-error-lnk1169-when-building-itk-with-rtk-python-wrappers-on-windows/7635)

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**Author:** [@gaoweilin](https://discourse.itk.org/u/gaoweilin)\
**Replies:** 9\
**Last updated:** [September 21, 2025, 8:04pm UTC](https://discourse.itk.org/t/build-error-lnk1169-when-building-itk-with-rtk-python-wrappers-on-windows/7635 "2025-09-21T20:04:03Z")

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I am encountering a linker error (LNK1169) while trying to build the ITK Python wrappers for the Reconstruction Toolkit (RTK). The build fails to generate the itk\_RTKPython.pyd file. I have tried several common troublesh…

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## [volume regularization using ITK](https://discourse.itk.org/t/volume-regularization-using-itk/7594)

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**Author:** [@Eva\_Monclus\_Lahoya](https://discourse.itk.org/u/Eva_Monclus_Lahoya)\
**Replies:** 4\
**Last updated:** [September 19, 2025, 8:29pm UTC](https://discourse.itk.org/t/volume-regularization-using-itk/7594 "2025-09-19T20:29:29Z")

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Hello, I’m working on a Python application that uses ITK, and I’m looking for guidance on how to regularize or resample a 3D volume when the slice spacing is not uniform—i.e., the distance between slices varies througho…

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## [SimpleITK 3.0.0 Alpha 1](https://discourse.itk.org/t/simpleitk-3-0-0-alpha-1/7637)

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**Author:** [@blowekamp](https://discourse.itk.org/u/blowekamp)\
**Replies:** 0\
**Last updated:** [September 19, 2025, 4:10pm UTC](https://discourse.itk.org/t/simpleitk-3-0-0-alpha-1/7637 "2025-09-19T16:10:44Z")

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Release Notes for SimpleITK v3.0.0 Alpha Release 1 This is an initial Alpha Release of a major version change of SimpleITK. Please test the new building infrastructure, the package binaries, and report and issues encount…

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## [Would like to develop a method to identify cranial openings in surface model via ITK-Snap... must I synthesize a Dicom/Analyze image?](https://discourse.itk.org/t/would-like-to-develop-a-method-to-identify-cranial-openings-in-surface-model-via-itk-snap-must-i-synthesize-a-dicom-analyze-image/7631)

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**Author:** [@MichelODU](https://discourse.itk.org/u/MichelODU)\
**Replies:** 4\
**Last updated:** [September 16, 2025, 3:20pm UTC](https://discourse.itk.org/t/would-like-to-develop-a-method-to-identify-cranial-openings-in-surface-model-via-itk-snap-must-i-synthesize-a-dicom-analyze-image/7631 "2025-09-16T15:20:34Z")

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Dear ITK users, I would like to develop a method to identify cranial openings in surface model via ITK-Snap… must I synthesize a Dicom/Analyze image via ITK first? Is there a way to do this in a manner that precisely sp…

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## [If I want to use rtkLagCorrectionImageFilterfor correction, are there any materials I can refer to?](https://discourse.itk.org/t/if-i-want-to-use-rtklagcorrectionimagefilterfor-correction-are-there-any-materials-i-can-refer-to/7630)

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**Author:** [@ma1282029525](https://discourse.itk.org/u/ma1282029525)\
**Replies:** 4\
**Last updated:** [September 15, 2025, 3:37pm UTC](https://discourse.itk.org/t/if-i-want-to-use-rtklagcorrectionimagefilterfor-correction-are-there-any-materials-i-can-refer-to/7630 "2025-09-15T15:37:23Z")

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If I want to use rtkLagCorrectionImageFilter for correction, are there any materials I can refer to?How can I obtain the parameters for: -a, --rates=FLOAT Lag rates (a0, a1, a2, a3) -c, --coefficients=FLOAT Lag coeffic…

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## [Dice Coefficient Calculation in Python](https://discourse.itk.org/t/dice-coefficient-calculation-in-python/7628)

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**Author:** [@blue\_sky](https://discourse.itk.org/u/blue_sky)\
**Replies:** 2\
**Last updated:** [September 11, 2025, 9:01am UTC](https://discourse.itk.org/t/dice-coefficient-calculation-in-python/7628 "2025-09-11T09:01:10Z")

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Hello everyone, I’m trying to compute the Dice coefficient using a Python script. To implement this, I have used ideas and code from the following links: “SimpleITK-Notebooks/Python/34\_Segmentation\_Evaluation.ipynb at…

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## [ITK 5.4.4 has been released!](https://discourse.itk.org/t/itk-5-4-4-has-been-released/7565)

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**Author:** [@matt.mccormick](https://discourse.itk.org/u/matt.mccormick)\
**Replies:** 4\
**Last updated:** [September 10, 2025, 3:33pm UTC](https://discourse.itk.org/t/itk-5-4-4-has-been-released/7565 "2025-09-10T15:33:06Z")

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We are pleased to announce the release of ITK 5.4.4, a maintenance update delivering critical improvements while maintaining API stability. This is latest maintenance update for this cross-platform, open-source toolkit s…

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## [Registration of CT Images with Large Organ Deformations](https://discourse.itk.org/t/registration-of-ct-images-with-large-organ-deformations/7627)

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**Author:** [@blue\_sky](https://discourse.itk.org/u/blue_sky)\
**Replies:** 1\
**Last updated:** [September 2, 2025, 7:49pm UTC](https://discourse.itk.org/t/registration-of-ct-images-with-large-organ-deformations/7627 "2025-09-02T19:49:17Z")

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Hello everyone, I have two CT images that I want to register together. One is from external beam radiotherapy (EBRT), and the other is from brachytherapy. Before registration, I harmonized both images by making their Or…

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## [Is there a complete example to use itk::CartesianToPolarTransform to transform an image?](https://discourse.itk.org/t/is-there-a-complete-example-to-use-itk-cartesiantopolartransform-to-transform-an-image/7623)

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**Author:** [@ma1282029525](https://discourse.itk.org/u/ma1282029525)\
**Replies:** 5\
**Last updated:** [September 1, 2025, 7:09am UTC](https://discourse.itk.org/t/is-there-a-complete-example-to-use-itk-cartesiantopolartransform-to-transform-an-image/7623 "2025-09-01T07:09:39Z")

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I want to complete the task of removing ring artifacts. I also came across the FourierStripeArtifactImageFilter class, but I failed at the previous step—I am unable to convert the Cartesian coordinate system image to a p…

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## [Does the itk:: GDCMSeriesFileNames:: SetInputDirectory function support Chinese paths as parameters?](https://discourse.itk.org/t/does-the-itk-gdcmseriesfilenames-setinputdirectory-function-support-chinese-paths-as-parameters/7625)

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**Author:** [@fuqiangqiang1](https://discourse.itk.org/u/fuqiangqiang1)\
**Replies:** 1\
**Last updated:** [August 28, 2025, 12:59pm UTC](https://discourse.itk.org/t/does-the-itk-gdcmseriesfilenames-setinputdirectory-function-support-chinese-paths-as-parameters/7625 "2025-08-28T12:59:37Z")

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When I am using the itk:: GDCMSeriesFileNames:: SetInputDirectory function, the parameters passed contain Chinese, and then using the itk:: GDCMSeriesFileNames::GetIputFileNames function cannot obtain the dicom sequence …

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## [rtksimulatedgeometry\_ggo.h "verbose\_flag": not "args\_info\_rtksimulatedgeometry" member](https://discourse.itk.org/t/rtksimulatedgeometry-ggo-h-verbose-flag-not-args-info-rtksimulatedgeometry-member/7619)

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**Author:** [@ma1282029525](https://discourse.itk.org/u/ma1282029525)\
**Replies:** 2\
**Last updated:** [August 27, 2025, 1:16pm UTC](https://discourse.itk.org/t/rtksimulatedgeometry-ggo-h-verbose-flag-not-args-info-rtksimulatedgeometry-member/7619 "2025-08-27T13:16:12Z")

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Is this a compilation bug or a configuration error? I removed the verbose conditional compilation and it passed.

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## [Unifying CT Images Geometry and Cropping to Common ROI](https://discourse.itk.org/t/unifying-ct-images-geometry-and-cropping-to-common-roi/7614)

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**Author:** [@blue\_sky](https://discourse.itk.org/u/blue_sky)\
**Replies:** 3\
**Last updated:** [August 25, 2025, 5:11pm UTC](https://discourse.itk.org/t/unifying-ct-images-geometry-and-cropping-to-common-roi/7614 "2025-08-25T17:11:31Z")

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Hi everyone, I am currently working on a medical image processing task that involves the registration of five CT image series for a single patient. My dataset consists of: One CT scan acquired during an External Radiot…

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## [RTK 2.7 + CUDA 12.3 Compiled with CUDA Enabled but Using CPU Filter (FDKConeBeamReconstructionFilterinstead of CudaFDKConeBeamReconstructionFilter)](https://discourse.itk.org/t/rtk-2-7-cuda-12-3-compiled-with-cuda-enabled-but-using-cpu-filter-fdkconebeamreconstructionfilterinstead-of-cudafdkconebeamreconstructionfilter/7617)

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**Author:** [@ma1282029525](https://discourse.itk.org/u/ma1282029525)\
**Replies:** 3\
**Last updated:** [August 24, 2025, 1:14am UTC](https://discourse.itk.org/t/rtk-2-7-cuda-12-3-compiled-with-cuda-enabled-but-using-cpu-filter-fdkconebeamreconstructionfilterinstead-of-cudafdkconebeamreconstructionfilter/7617 "2025-08-24T01:14:32Z")

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I compiled ITK 5.4.3 and RTK 2.7.0 with CUDA 12.3 support (NVIDIA driver updated). Build confirmation: • RTK\_USE\_CUDA=ONin CMake • RTK\_USE\_CUDAmacro defined in code • No errors during compilation, RTKCudalibrari…

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## [Supressing/eliminating python wrapping warnings](https://discourse.itk.org/t/supressing-eliminating-python-wrapping-warnings/7616)

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**Author:** [@darrent1974](https://discourse.itk.org/u/darrent1974)\
**Replies:** 4\
**Last updated:** [August 21, 2025, 4:18am UTC](https://discourse.itk.org/t/supressing-eliminating-python-wrapping-warnings/7616 "2025-08-21T04:18:59Z")

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Hi, I’ve been using a custom build of ITK (v5.4.2) with python wrapping for some time. We also happen to wrap some extra types, image and vector dimensions as part of the build, i.e., When initialising the library f…

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## [MeanErrorNorm and MaxErrorNorm in InvertDisplacementFieldImageFilter](https://discourse.itk.org/t/meanerrornorm-and-maxerrornorm-in-invertdisplacementfieldimagefilter/7492)

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**Author:** [@reox](https://discourse.itk.org/u/reox)\
**Replies:** 15\
**Last updated:** [August 18, 2025, 4:31pm UTC](https://discourse.itk.org/t/meanerrornorm-and-maxerrornorm-in-invertdisplacementfieldimagefilter/7492 "2025-08-18T16:31:06Z")

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I recently started a project where I would need to invert a BSplineTransformation. I dug now a bit into the different algorithms that ITK provides and had a look at the code. For the InvertDisplacementFieldImageFilter I …

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## [Limit Number of threads in python SimpleITK programatically](https://discourse.itk.org/t/limit-number-of-threads-in-python-simpleitk-programatically/2723)

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**Author:** [@reox](https://discourse.itk.org/u/reox)\
**Replies:** 6\
**Last updated:** [August 13, 2025, 6:44pm UTC](https://discourse.itk.org/t/limit-number-of-threads-in-python-simpleitk-programatically/2723 "2025-08-13T18:44:23Z")

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I’m using SimpleITK from python. By default all logical CPUs which are found are used, but I like to constrict this. I already read this thread here: https://discourse.itk.org/t/threading-in-itk/782 and can confirm that …

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## [Faster interpolation using sitkLabelGaussian](https://discourse.itk.org/t/faster-interpolation-using-sitklabelgaussian/6183)

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**Author:** [@dyoll](https://discourse.itk.org/u/dyoll)\
**Replies:** 11\
**Last updated:** [August 1, 2025, 10:13pm UTC](https://discourse.itk.org/t/faster-interpolation-using-sitklabelgaussian/6183 "2025-08-01T22:13:22Z")

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Hi I am working on a MONAI-based whole head segmentation tool, which predicts close to 30 tissue labels. Currently all post-processing is implemented in Python using SimpleITK. Once we have done some clean-up operation…

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## [Not able to get RTK speedups on GPU](https://discourse.itk.org/t/not-able-to-get-rtk-speedups-on-gpu/7507)

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**Author:** [@whitaker](https://discourse.itk.org/u/whitaker)\
**Replies:** 11\
**Last updated:** [July 28, 2025, 9:24pm UTC](https://discourse.itk.org/t/not-able-to-get-rtk-speedups-on-gpu/7507 "2025-07-28T21:24:47Z")

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Hi. I am using RTK to do iterative reconstruction. Everything seems to be working, except when trying to run things on the GPU. Everything compiles fine and it runs. However, when the GPU-compiled programs run, they …

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## [Multiple series in a single CT series](https://discourse.itk.org/t/multiple-series-in-a-single-ct-series/1525)

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**Author:** [@hadasara](https://discourse.itk.org/u/hadasara)\
**Replies:** 18\
**Last updated:** [July 28, 2025, 6:57pm UTC](https://discourse.itk.org/t/multiple-series-in-a-single-ct-series/1525 "2025-07-28T18:57:53Z")

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Hi all, Maybe someone here would know- I came across a CT series, that include 2 series, saved as a single one. When you scroll in axial slices, you see shoulder s to pelvis and then agin shoulders to pelvis in a late…

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## [The effect of mutual information rigid registration is extremely poor.](https://discourse.itk.org/t/the-effect-of-mutual-information-rigid-registration-is-extremely-poor/7600)

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**Author:** [@wen](https://discourse.itk.org/u/wen)\
**Replies:** 1\
**Last updated:** [July 23, 2025, 8:03am UTC](https://discourse.itk.org/t/the-effect-of-mutual-information-rigid-registration-is-extremely-poor/7600 "2025-07-23T08:03:52Z")

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Using the Mattes Mutual Information Image-to-Image Metric v4 as the similarity measurement for three-dimensional rigid registration, their initial gradient is not equal to zero and the registration results of two comple…

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## [Multi-resolution registration anomaly](https://discourse.itk.org/t/multi-resolution-registration-anomaly/7591)

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**Author:** [@wen](https://discourse.itk.org/u/wen)\
**Replies:** 2\
**Last updated:** [July 23, 2025, 7:18am UTC](https://discourse.itk.org/t/multi-resolution-registration-anomaly/7591 "2025-07-23T07:18:18Z")

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When utilizing the ImageRegistrationMethodv4 for multi-resolution registration, I encountered the following unusual behavior: In cases where the initial positions of the images to be registered were significantly misal…

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## [MRI-CT phantom registration](https://discourse.itk.org/t/mri-ct-phantom-registration/7598)

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**Author:** [@rohit\_inippully](https://discourse.itk.org/u/rohit_inippully)\
**Replies:** 3\
**Last updated:** [July 22, 2025, 1:46pm UTC](https://discourse.itk.org/t/mri-ct-phantom-registration/7598 "2025-07-22T13:46:00Z")

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I am trying to register (rigid) a MRI image of a phantom to its CT image. However, I am not getting the results I need. I am using MattesMutual Metric, and regularstepgradient, Euler3DTransform, etc. Has anyone encoun…

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## [Run python test by the CI](https://discourse.itk.org/t/run-python-test-by-the-ci/7597)

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**Author:** [@axel\_garcia](https://discourse.itk.org/u/axel_garcia)\
**Replies:** 3\
**Last updated:** [July 18, 2025, 2:02pm UTC](https://discourse.itk.org/t/run-python-test-by-the-ci/7597 "2025-07-18T14:02:41Z")

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Hello, I’m working on the CudaCommon remote module and need an efficient way to test Python packages from generated wheels in our CI pipeline. Current options have limitations: The first approach with itk\_python\_add\_tes…

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## [ITK Adopts NumFOCUS Code of Conduct - Important Community Update](https://discourse.itk.org/t/itk-adopts-numfocus-code-of-conduct-important-community-update/7596)

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**Author:** [@matt.mccormick](https://discourse.itk.org/u/matt.mccormick)\
**Replies:** 0\
**Last updated:** [July 15, 2025, 6:43pm UTC](https://discourse.itk.org/t/itk-adopts-numfocus-code-of-conduct-important-community-update/7596 "2025-07-15T18:43:58Z")

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Hello ITK Community, I’m writing to inform you of an important update to our community guidelines. The Insight Software Consortium has formally resolved to adopt the NumFOCUS Code of Conduct, and we’re updating our docu…

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## [ITK Git repository primary branch name transition from master to main](https://discourse.itk.org/t/itk-git-repository-primary-branch-name-transition-from-master-to-main/7569)

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**Author:** [@matt.mccormick](https://discourse.itk.org/u/matt.mccormick)\
**Replies:** 5\
**Last updated:** [July 4, 2025, 9:27am UTC](https://discourse.itk.org/t/itk-git-repository-primary-branch-name-transition-from-master-to-main/7569 "2025-07-04T09:27:06Z")

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Hi folks, ITK’s default, primary branch name has been renamed from master to main. New GitHub clones will default to this branch. A few notes on changes that might be required. GitHub Forks When you visit your fork o…

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## [pixi not being found at the expected location at development setup](https://discourse.itk.org/t/pixi-not-being-found-at-the-expected-location-at-development-setup/7589)

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**Author:** [@jhlegarreta](https://discourse.itk.org/u/jhlegarreta)\
**Replies:** 4\
**Last updated:** [July 3, 2025, 1:09am UTC](https://discourse.itk.org/t/pixi-not-being-found-at-the-expected-location-at-development-setup/7589 "2025-07-03T01:09:32Z")

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Hi, I was trying to set up my local ITK for development on a Windows 10 machine following Contribute to ITK - ITK's documentation. I installed pixi using the MSI provided in their GitHub release page. It turns out tha…

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## [\`long double\` support for ImageIO, MeshIO pixels?](https://discourse.itk.org/t/long-double-support-for-imageio-meshio-pixels/7570)

<div class="topic-metadata">

**Author:** [@Niels\_Dekker](https://discourse.itk.org/u/Niels_Dekker)\
**Replies:** 16\
**Last updated:** [July 2, 2025, 4:17pm UTC](https://discourse.itk.org/t/long-double-support-for-imageio-meshio-pixels/7570 "2025-07-02T16:17:49Z")

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Should ITK’s ImageIO and MeshIO both support long double as a possible type for pixel components? The IOComponent enum class has an enumerator for long double, named LDOUBLE, at ITK/Modules/Core/Common/include/itkCommonE…

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## [Distance map process is very memory expensive](https://discourse.itk.org/t/distance-map-process-is-very-memory-expensive/7587)

<div class="topic-metadata">

**Author:** [@Limz](https://discourse.itk.org/u/Limz)\
**Replies:** 2\
**Last updated:** [July 1, 2025, 3:06pm UTC](https://discourse.itk.org/t/distance-map-process-is-very-memory-expensive/7587 "2025-07-01T15:06:16Z")

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Hi, I am using SimpleITK to compute distance map of a volume of 3Go on my machine of 16Go of RAM. But i am getting crash saying “Failed to allocate memory for image”. I tested the maurer and daniels functions. Is there…

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